getRecords with lasttimemodified in the Zoho Support API

Using the getRecords call, is there anyway to use the lastmodifiedtime parameter? The url that I am trying to use is as follows (I hid the authoken,portal,and department fields)

https://support.zoho.com/api/xml/requests/getrecords?authtoken=AUTHTOKEN&

scope=supportapi&

portal=PORTAL&

department=DEPARTMENT&

lastmodifiedtime=2013-08-02 12:12:12

The response I am getting is

Copy code

< code >

1001

</ code >

< message >

Unable to process your request. Please verify if the name and value is appropriate for the "lastmodifiedtime" parameter.

Your API guide says

The value for lastmodifiedtime parameter should be in yyyy-MM-dd HH:mm:ss format

I follow that format. Any Ideas?

Thank you,

Alex